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neodymium magnets

We offer blue color magnets Nd2Fe14B - our offer. Practically all "neodymium magnets" in our store are available for immediate purchase (see the list). See the magnet pricing for more details see the magnet price list

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MP 12x8/4x3 / N38 - neodymium magnet

ring magnet

catalog number 030395

no reviews

external diameter Ø

12 mm [±0,1 mm]

internal diameter Ø

8/4 mm [±0,1 mm]


3 mm [±0,1 mm]

magnetizing direction

↑ axial

capacity ~

0.68 kg / 6.67 N

magnetic induction ~

237.19 mT / 2,372 Gs

max. temperature

≤ 80 °C

2.64 PLN gross price (including VAT) / pcs +

2.15 PLN net price + 23% VAT / pcs

bulk discounts:

need more quantity?

price from 1 pcs
2.15 PLN
2.64 PLN
price from 280 pcs
2.02 PLN
2.48 PLN
price from 1024 pcs
1.89 PLN
2.32 PLN

Want to bargain?

Call us tel: +48 22 499 98 98 or get in touch via form on the contact page. You can check the lifting capacity as well as the appearance of neodymium magnets in our force calculator force calculator

Orders placed by 2:00 PM will be shipped on the same business day.

Specification: ring magnet 12x8/4x3 / N38 ↑ axial

Characteristics: ring magnet 12x8/4x3 / N38 ↑ axial
catalog number
production / distribution
Dhit sp. z o.o.
country of origin
Poland / China / Germany
customs code
external diameter Ø
12 mm [±0,1 mm]
internal diameter Ø
8/4 mm [±0,1 mm]
3 mm [±0,1 mm]
magnetizing direction ?
↑ axial
capacity ~ ?
0.68 kg / 6.67 N
magnetic induction ~ ?
237.19 mT / 2,372 Gs
max. temperature ?
≤ 80 °C
coating type ?
[NiCuNi] nickel
2.26 g
execution tolerance
± 0.1 mm

Magnetic properties of the material N38

material characteristics N38
remenance Br [Min. - Max.] ?
remenance Br [Min. - Max.] ?
coercivity bHc ?
coercivity bHc ?
actual internal force iHc
≥ 12
actual internal force iHc
≥ 955
energy density [Min. - Max.]
BH max MGOe
energy density [Min. - Max.]
BH max KJ/m
max. temperature
≤ 80

Physical properties of sintered neodymium magnets Nd2Fe14B

Physical properties of sintered neodymium magnets Nd2Fe14B
Vickers hardness
Curie Temperature TC
312 - 380
Curie Temperature TF
593 - 716
Specific resistance
Bending strength
Compressive strength
Thermal expansion parallel (∥) to orientation (M)
(3-4) x 106
Thermal expansion perpendicular (⊥) to orientation (M)
-(1-3) x 10-6
Young's modulus
1.7 x 104
Neodymium magnets MP 12x8/4x3 / N38 in a ring form are commonly used in various industries due to their unique properties. Thanks to a powerful magnetic field of 0.68 kg, which can be described as strength, they are extremely useful in applications that require high magnetic power in a compact space. Applications of MP 12x8/4x3 / N38 magnets include electric motors, generators, sound devices, and several other devices that use magnets for generating motion or energy storage. Despite their powerful strength, they have a relatively low weight of 2.26 grams, which makes them more practical compared to heavier alternatives.

List recommended items

Advantages as well as disadvantages of neodymium magnets NdFeB.

Apart from immense power, neodymium magnets have the following advantages:

  • They do not lose power over time - after approximately 10 years, their power decreases by only ~1% (theoretically),
  • They are highly resistant to demagnetization by external magnetic sources,
  • In other words, thanks to the shiny coating of nickel, gold, or silver, the element acquires an aesthetic appearance,
  • They possess very high magnetic induction on the surface of the magnet,
  • By using an appropriate combination of materials, they can achieve high thermal resistance, allowing them to operate at temperatures up to 230°C and above...
  • The ability for precise shaping or customization to specific needs – neodymium magnets can be produced in a wide range of shapes and sizes, which expands the range of their possible uses.
  • Key role in the industry of new technologies – are utilized in HDD drives, electric motors, medical devices or very modern machines.

Disadvantages of neodymium magnets:

  • They can break as they are extremely fragile when subjected to a powerful impact. If the magnets are exposed to impacts, we recommend using magnets in a metal holder. The steel housing in the form of a holder protects the magnet from impacts and also increases its overall strength,
  • They lose power at high temperatures. Most neodymium magnets experience permanent loss of strength when heated above 80°C (depending on the form and height). However, we also offer special magnets with high temperature resistance, up to 230°C,
  • They rust in a humid environment - during outdoor use, we recommend using waterproof magnets, such as those made of rubber or plastic,
  • Limited ability to create threads or complex shapes in the magnet - the use of a housing is recommended - magnetic holder
  • Health risk associated with microscopic parts of magnets are risky, in case of ingestion, which is crucial in the context of child safety. Additionally, miniscule components of these devices have the potential to complicate diagnosis when they are in the body.

Handle with Care: Neodymium Magnets

Dust and powder from neodymium magnets are flammable.

Do not attempt to drill into neodymium magnets. Mechanical processing is also not recommended. Once crushed into fine powder or dust, this material becomes highly flammable.

Neodymium magnets can become demagnetized at high temperatures.

Even though magnets have been found to maintain their efficacy up to temperatures of 80°C or 175°F, it's essential to consider that this threshold may fluctuate depending on the magnet's type, configuration, and intended usage.

Keep neodymium magnets as far away as possible from GPS and smartphones.

Neodymium magnets produce strong magnetic fields that interfere with magnetometers and compasses used in navigation, as well as internal compasses of smartphones and GPS devices.

Neodymium magnets are not recommended for people with pacemakers.

In the case of neodymium magnets, there is a strong magnetic field. As a result, it interferes with the operation of a heart pacemaker. Even if the magnetic field does not affect the device, it can damage its components or deactivate the entire device.

 Maintain neodymium magnets away from children.

Neodymium magnets are not toys. You cannot allow them to become toys for children. In such a situation, surgery is necessary to remove them. In the worst case scenario, it can result in death.

Neodymium magnetic are characterized by their fragility, which can cause them to crumble.

In the event of a collision between two neodymium magnets, it can result in them getting chipped. Despite being made of metal as well as coated with a shiny nickel plating, they are not as hard as steel. In the case of a collision between two magnets, there can be a scattering of small sharp metal fragments in different directions. Protecting your eyes is essential.

The magnet is coated with nickel - be careful if you have an allergy.

Studies show a small percentage of people have allergies to certain metals, including nickel. An allergic reaction often manifests as skin redness and rash. If you have a nickel allergy, you can try wearing gloves or simply avoid direct contact with nickel-plated neodymium magnets.

Neodymium Magnets can attract to each other, pinch the skin, and cause significant injuries.

If have a finger between or alternatively on the path of attracting magnets, there may be a serious cut or a fracture.

Neodymium magnets are among the most powerful magnets on Earth. The surprising force they generate between each other can shock you.

Make sure to review all the information we have provided. This will help you avoid harm to your body and damage to the magnets.

Keep neodymium magnets away from the wallet, computer, and TV.

The strong magnetic field generated by neodymium magnets can destroy magnetic media such as floppy disks, video tapes, HDDs, credit cards, magnetic ID cards, cassette tapes, or other devices. They can also destroy devices like video players, televisions, CRT computer monitors. Do not forget to keep neodymium magnets at a safe distance from these electronic devices.

To illustrate why neodymium magnets are so dangerous, see the article - How dangerous are strong neodymium magnets?.

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e-mail: bok@dhit.pl

tel: +48 888 99 98 98